CN102583815A - Method for treating waste liquid produced during on-line chemical oxygen demand (COD) determination with potassium dichromate method - Google Patents

Method for treating waste liquid produced during on-line chemical oxygen demand (COD) determination with potassium dichromate method Download PDF

Info

Publication number
CN102583815A
CN102583815A CN2012100196677A CN201210019667A CN102583815A CN 102583815 A CN102583815 A CN 102583815A CN 2012100196677 A CN2012100196677 A CN 2012100196677A CN 201210019667 A CN201210019667 A CN 201210019667A CN 102583815 A CN102583815 A CN 102583815A
Authority
CN
China
Prior art keywords
waste liquid
potassium dichromate
cod
reaction
interference
Prior art date
Application number
CN2012100196677A
Other languages
Chinese (zh)
Other versions
CN102583815B (en
Inventor
张娟
储杰
吕建奎
储岳海
聂中杰
储岳喜
Original Assignee
马鞍山市桓泰环保设备有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 马鞍山市桓泰环保设备有限公司 filed Critical 马鞍山市桓泰环保设备有限公司
Priority to CN 201210019667 priority Critical patent/CN102583815B/en
Publication of CN102583815A publication Critical patent/CN102583815A/en
Application granted granted Critical
Publication of CN102583815B publication Critical patent/CN102583815B/en

Links

Abstract

The invention discloses a method for treating waste liquid produced during on-line chemical oxygen demand (COD) determination with a potassium dichromate method, and belongs to the field of waste liquid treatment. The method is characterized in that a certain proportion of reducing salt is adopted to react with the waste liquid into which an interference removing solvent is added; then alkali is added into the waste liquid and a precipitation reaction is conducted; and finally, the waste liquid stands still to precipitate, and a supernatant can be emitted up to standard after the pH (potential of hydrogen) value is regulated. The method has the advantages as follows: through using the interference removing solvent the utility model effectively solves the problems that high-concentration sulfuric acid in the waste liquid participates in the chemical reactions to produce SO2 to harm the physical health of an operator, and as SO42 minus ions in the waste liquid interferes following chemical reaction steps, the aim of toxic heavy metal removal,; through adding the reducing salt, high-toxic Cr6 plus ions are changed to low-toxic Cr3 plus ions; through adding the alkali, precipitates finally generated in the precipitation reaction only contain non-toxic or low-toxic compounds of the heavy metal; and the reaction speed is high, the whole reaction process can be completed within 5 minutes, and a reaction effect is easy to identify according to color.

Description

The method for treating waste liquid that potassium dichromate process on-line determination COD produces
Technical field
The present invention relates to a kind of method for treating waste liquid, be specifically related to the method for treating waste liquid that potassium dichromate process on-line determination COD produces.
Background technology
Potassium dichromate process measure COD be consistent mensuration COD standard method of generally acknowledging both at home and abroad at present (NEPA's volume. water and effluent monitoring analytical procedure [M]. the 4th edition. Beijing: environmental science press, 2002,10-213).The principle of measuring is: the mixed solution of water sample, SRM 935a, Sulfuric acid disilver salt and the vitriol oil is heated to 175 ℃ in digestion pool; Chromium ion is reduced the III valency and changes color from the VI valency as oxygenant; The content of organic cpds becomes corresponding relation, COD in the change degree of color and the sample MaxAnalytical instrument converts through colorimetric and directly the COD in the sample is shown.For avoiding muriatic interference, in mixed solution, add Mercury bisulfate.Therefore, it is high to measure in the waste liquid of COD acidity, and the content of toxic heavy metal mercury, chromium, silver is high.If not treated, directly enter water drain, can cause serious secondary pollution.Especially along with the increasing of environment supervision; Source of pollution on-line monitoring equipment is all actively being installed by various places environmental administration, and current most of import and home-made " COD on line analyzer " all adopt the GB potassium dichromate process to measure COD, and these on line analyzers all do not design the treatment unit of waste liquid; These contain toxic heavy metal ionic discharging of waste liquid in water drain or field environment; Though each amount is little, concentration is higher, accumulates over a long period; Still can cause serious secondary pollution, seem urgent day by day so study the treatment process of this waste liquid.
At present the treatment process of measuring the COD waste liquid is mainly contained 3 kinds, the 1st kind of elder generation considers to be worth doing silver ions (Ag with aluminium +) with waste liquid in remaining VI valency chromium (Cr 6+) ion generation redox reaction, generate silver-colored simple substance (Ag) and III valency chromium ion (Cr 3+), filtration can obtain silver powder, and the back makes Al with ammoniacal liquor or highly basic sodium hydroxide 3+, Hg 2+, Cr 3+Produce precipitin reaction, thereby obtain white lake (Al (OH) 3), mercuric hydroxide (Hg (OH) 2), chromium hydroxide (Cr (OH) 3) solid (Huang Fengzhen, Zhu Zhiqiang. potassium dichromate process is measured liquid waste disposal and the comprehensive utilization [J] of COD. pollution prevention technique, 2008,3 (21): 94-95); The 2nd kind with silver ions (Ag in the sodium chloride solution removal waste liquid +), the back makes Cr with alkali 3+, Hg 2+Produce deposition, thus reach the purpose of removing heavy metal ion (Tao Liying. potassium dichromate process is measured COD liquid waste disposal design for scheme [J]. Jinzhou Medical College's journal, 2001,23 (2): 2526); In the 3rd kind of " COD on line analyzer " specification sheets to the treatment process of waste liquid: in the 10L waste liquid, add 30gNaCl, fully stir, make to generate the AgCl deposition, more than the static 12h, inclining in supernatant and the separated liquid supernatant adds 15-20gFeSO 47H 2O is to reduce excessive Cr 6+, fully stir the back and add about 1600gNaOH with the excessive H that neutralizes 2SO 4, regulate the pH value and add 40gNa again for 8-9. 2S9H 2O makes Cr 3+, Fe 3+, co-precipitation such as mercury.After deposition was complete, supernatant directly discharged, and residue is done Hazardous wastes and handled.Find that through test of many times these 3 kinds of treatment process are difficult to transporting in actually operating and commercialization process.Its reason: the 1st kind of the first step speed of response is very slow; Do not consider unnecessary Cr for the 2nd kind 6+Processing, the waste liquid after causing handling is glassy yellow, the heavy metal ion in the waste liquid is handled not thoroughly; The 3rd kind is perfectly in theory, in actual mechanical process because do not consider the influence of other interfering factorss, waste liquid finally all changes solid into, does not reach the result of expectation at all.In addition, the 3rd kind of method reckons without the SO that the vitriol oil is participated in the disturbance reponse generation in the waste liquid 2Gas pollutant.
Summary of the invention
The technical problem that invention will solve
Adopt the problem of the toxic heavy metal ion liquid waste disposal that produces in national standard method (GB/T11914-1989) the on-line measurement COD process to current environmental protection field; And in the prior art to the many disadvantages of liquid waste disposal; The method for treating waste liquid that the present invention provides potassium dichromate process on-line determination COD to produce; Can make the toxic heavy metal ion waste liquid harmless treatment that produces in the national standard method on-line measurement COD process, prevent that secondary pollution from taking place.
. Technical scheme
Inventive principle: interference with solvent is gone in configuration, goes waste liquid and a certain proportion of reductibility salt hybrid reaction of interference with solvent through adding, with the VI valency chromium ion (Cr in the solution 6+) be reduced into III valency chromium ion (Cr 3+); Go simultaneously interference with solvent, the vitriol oil has been accelerated the reaction in the solution to the interference of subsequent chemical reaction in the elimination waste liquid; Adding a certain proportion of alkali afterwards becomes all heavy metal ion into the precipitable solid of chemical combination attitude and separates out; But supernatant is handled just qualified discharge of back through simple pH, has realized handling fast with effectively of waste liquid, and will be not easy to store to change into transportation, the higher solution of toxicity and be prone to storage and transportation, solid that toxicity is lower.
Technical scheme of the present invention is following:
The method for treating waste liquid that potassium dichromate process on-line determination COD produces the steps include:
(1) interference with solvent is gone in preparation: take by weighing salt of wormwood and sodium hydrogencarbonate, preparation contains K +, Na +, HCO 3 -, CO 3 2-Solion, each ionic concn is: K +: 0.2-0.33g/L, Na +: 0.11-0.19g/L, HCO 3 -: 0.29-0.50g/L, CO 3 2-: 0.15-0.25g/L, the pH value of solution scope is between 6.5~8.5;
(2) in waste liquid, add the interference with solvent of going that step (1) disposed: go interference with solvent can dilute vitriol oil concentration in the waste liquid, prevent its oxidation-reduction quality salt in step 3, reduced SO in the waste liquid simultaneously 4 2-(Ag 2SO 4, HgSO 4) ionic concentration, avoid it in step 3, to generate vitriol and separate out and disturb Cr 3+, Hg 2+, Ag +Ion is converted into chemical combination attitude deposition;
(3) reductibility salt is added through in the reacted mixing solutions of step (2): make the strong VI valency chromium ion Cr of remaining toxicity in the waste liquid through adding reductibility salt 6+Be reduced into the low III valency chromium ion Cr of toxicity 3+
(4) will pass through in the pretreated waste liquid of step (3) and add alkali, make Cr 3+, Hg 2+, Ag +Ion is converted into chemical combination attitude deposition and collects;
(5) reacted supernatant in the step (4) is carried out simple pH and handle, the pH value of regulating supernatant is the 7.0-8.0 qualified discharge.Through detecting, only contain ion in the supernatant, heavy metal Ag to the environment toxicological harmless +, Hg 2+, Cr 3+, Cr 6+Content is almost nil, well below the index request of national standard.
Wherein, step is gone interference with solvent described in (1), and normal temperature and pressure is the transparent liquid of colorless and odorless down, and cheap easy the acquisition, and to environment toxicological harmless effect, the quality of its adding and waste liquid volume ratio are 1000-5000g:1L in step 2.
The metal ions in waste liquor concentration that potassium dichromate process on-line determination COD described in the step (2) produces is Hg 2+: 1-6.8g/L, Cr 6+: 0-2.83g/L, Cr 3+: 0-2.83g/L, Ag +: 0.1-2.22g/L.
Reductibility salt described in the step (3) is Na 2SO 3, Na 2S 2O 35H 2O, FeSO 47H 2O, Fe 2(SO 3) 3, FeSO 4, FeCl 2In a kind of or any two or more combination, the quality of its adding with the ratio of the volume of waste liquid is: 0-100g:1L.
Alkali is NaOH or Na in the step 4 2CO 3In a kind of, the quality of its adding with the ratio of the volume of waste liquid is: 10-600g:1L.
The solution of the adjusting supernatant described in the step (5) is a kind of in hydrochloric acid soln or the sulphuric acid soln, and its concentration of volume percent is 10%-30%.
Beneficial effect
The present invention can be fast, comprehensively handle the waste liquid that adopts national standard method on-line determination COD to be produced, and realized will being not easy to store changing into transportation, the higher solution of toxicity being prone to storage and transportation, solid that toxicity is lower.This technology has the following advantages:
(1) the present invention goes interference with solvent through preparation and adding in step 1 and step 2, effectively avoids the vitriol oil of waste liquid middle and high concentration to participate in chemical reaction generation SO 2, harm health of operators, and SO in the waste liquid 4 2-Pair ion step 3, step 4 chemical reaction produce and disturb, and reach the purpose of effective removal toxic heavy metal;
(2) through adding reductibility salt, can be with deleterious VI valency chromium ion (Cr 6+) be reduced into the lower III valency chromium ion (Cr of toxicity 3+);
(3) through adding alkali or alkaline solution, the last throw out that generates of reaction is the very low compound of nontoxic or toxicity that only contains heavy metal, and volume is little, only accounts for 1/5 of overall solution volume, recovery, simple to operate;
(4) speed of response is fast, and entire reaction course can be accomplished in 5min, and reaction effect is easy to discern according to color.
Description of drawings
Fig. 1 is a technological principle schema of the present invention.
Among the figure: the first step goes the waste liquid of interference with solvent and the reductibility salts solution of corresponding proportion to react 1 adding; On reaction 1 basis, add alkali afterwards and react 2; These two reactions are all accomplished in several minutes, and the mixed solution that reaction 3 will be reacted 2 generations staticly settles, by the time behind the precipitated and separated; Add dilute acid soln in the process that supernatant is discharged and carry out the pH regulator processing, last qualified discharge.The throw out that reaction 2 is produced carries out press filtration or air-dry, forms the solid mud cake that contains heavy metal ion, and the unit that delivers to qualification after the centralized collection handles.
Embodiment
Embodiment 1:
In reactor drum, add the 1L waste liquid, metal ions in waste liquor concentration is Hg 2+: 1g/L, Cr 3+: 2.83g/L, Ag +: 0.1g/L; Interference with solvent is gone in preparation: take by weighing salt of wormwood and sodium hydrogencarbonate, preparation contains K +, Na +, HCO 3 -, CO 3 2-Solion 5000g, each ionic concn is: K +: 0.2g/L, Na +: 0.11g/L, HCO 3 -: 0.29g/L, CO 3 2-: 0.15g/L, the pH value of solution scope is between 6.5~8.5; In waste liquid, add the 5000g that is disposed and go interference with solvent, to wherein adding 0g reductibility salt, at this moment, do not contain Cr in the waste liquid again 6+Ion only contains Cr 3+Ion, stirring reaction, reaction in about 2 minutes finishes;
In reactor drum, add 10g alkali again, the kind of alkali is NaOH or Na 2CO 3In any one, behind the stirring reaction, reaction in about about 3 minutes finishes;
Static placement, the supernatant of draining adds 10% Hydrogen chloride supernatant is carried out simple pH processing, and the pH value of regulating supernatant is 7.0-8.0, collects settling simultaneously.
Embodiment 2:
In reactor drum, add the 1L waste liquid, metal ions in waste liquor concentration is Hg 2+: 6.8g/L, Cr 6+: 2.83g/L, Cr 3+: 0g/L, Ag +: 2.22g/L; Interference with solvent is gone in preparation: take by weighing salt of wormwood and sodium hydrogencarbonate, preparation contains K +, Na +, HCO 3 -, CO 3 2-Solion 1000g, each ionic concn is: K +: 0.28g/L, Na +: 0.15g/L, HCO 3 -: 0.40g/L, CO 3 2-: 0.22g/L, the pH value of solution scope is between 6.5~8.5; In waste liquid, add the 1000g that is disposed and go interference with solvent, to wherein adding 60g reductibility salt, reductibility salt is Na again 2SO 330g, Na 2S 2O 35H 2The O30g stirring reaction, reaction in about 2 minutes finishes;
In reactor drum, add 480g alkali again, the kind of alkali is NaOH or Na 2CO 3In any one, behind the stirring reaction, reaction in about about 3 minutes finishes;
Static placement, the supernatant of draining, adding concentration of volume percent is 30% hydrochloric acid, supernatant is carried out simple pH handle, the pH value of regulating supernatant is 7.0-8.0, collects settling simultaneously.
Embodiment 3:
In reactor drum, add the 1L waste liquid, metal ions in waste liquor concentration is Hg 2+: 2.8g/L, Cr 6+: 1.83g/L, Cr 3+: 1.0g/L, Ag +: 1.22g/L; Interference with solvent is gone in preparation: take by weighing salt of wormwood and sodium hydrogencarbonate, preparation contains K +, Na +, HCO 3 -, CO 3 2-Solion 3000g, each ionic concn is: K +: 0.33g/L, Na +: 0.19g/L, HCO 3 -: 0.50g/L, CO 3 2-: 0.25g/L,, the pH value of solution scope is between 6.5~8.5; In waste liquid, add the 3000g that is disposed and go interference with solvent, again to wherein adding 100g reductibility salt, reductibility salt FeSO 47H 2O is 20g, Fe 2(SO 3) 3Be 20g, FeSO 4Be 30g, FeCl 2Be the 30g stirring reaction, reaction in about 2 minutes finishes;
In reactor drum, add 480g alkali again, the kind of alkali is NaOH or Na 2CO 3In any one, behind the stirring reaction, reaction in about about 3 minutes finishes;
Static placement, the supernatant of draining, adding concentration of volume percent is 10% hydrochloric acid, supernatant is carried out simple pH handle, the pH value of regulating supernatant is 7.0-8.0, collects settling simultaneously.
Embodiment 4:
In reactor drum, add the 1L waste liquid, metal ions in waste liquor concentration is Hg 2+: 3g/L, Cr 6+: 2.83g/L, Ag +: 1.0g/L; Interference with solvent is gone in preparation: take by weighing salt of wormwood and sodium hydrogencarbonate, preparation contains K +, Na +, HCO 3 -, CO 3 2-Solion 3000g, each ionic concn is: K +: 0.33g/L, Na +: 0.19g/L, HCO 3 -: 0.50g/L, CO 3 2-: 0.25g/L, the pH value of solution scope is between 6.5~8.5; In waste liquid, add and remove interference with solvent 3000g, in waste liquid, add 60g reductibility salt again, reductibility salt is Na 2SO 3Be 10g, Na 2S 2O 35H 2O is 10g, FeSO 47H 2O is 20g, FeSO 4Be 10g, FeCl 2Behind the 10g stirring reaction, reaction in about 2 minutes finishes;
In reactor drum, add 480gNaOH again, behind the stirring reaction, reaction in about about 3 minutes finishes;
Static placement, the supernatant of draining, adding concentration of volume percent is 30% sulfuric acid, supernatant is carried out simple pH handle, the pH value of regulating supernatant is 7.0-8.0, collects settling simultaneously.
Embodiment 5:
In reactor drum, add the 1L waste liquid, fully stir waste liquid with pneumatic pump, metal ions in waste liquor concentration is Hg 2+: 6.8g/L, Cr 6+: 2.83g/L, Ag +: 2.22g/L; Interference with solvent is gone in preparation: take by weighing salt of wormwood and sodium hydrogencarbonate, preparation contains K +, Na +, HCO 3 -, CO 3 2-Solion 2500g, each ionic concn is: K +: 0.26g/L, Na +: 0.16g/L, HCO 3 -: 0.42g/L, CO 3 2-: 0.20g/L, the pH value of solution scope is between 6.5~8.5; , the pH value of solution scope is between 6.5~8.5; Go interference with solvent to wherein adding 2500g, again to adding 100g reductibility salt, reductibility salt Na 2SO 3Be 10g, Na 2S 2O 35H 2O is 40g, FeSO 47H 2O is 40g, FeSO 4Behind the 10g stirring reaction, reaction in about 2 minutes finishes;
Pneumatic pump continues to stir, and in reactor drum, adds 600gNaOH again;
Stop air agitator, mixed solution is discharged to a bigger container, leave standstill, supernatant is discharged in another container, and the use concentration of volume percent is to discharge the collection settling behind the 20% sulfuric acid adjusting pH to 7.0-8.0.
Embodiment 6:
In reactor drum, add the 1L waste liquid, fully stir waste liquid with pneumatic pump, metal ions in waste liquor concentration is Hg 2+: 3.0g/L, Cr 6+: 2.0g/L, Cr 3+: 0.83g/L, Ag +: 2.22g/L; Interference with solvent is gone in preparation: take by weighing salt of wormwood and sodium hydrogencarbonate, preparation contains K +, Na +, HCO 3 -, CO 3 2-Solion 5000g, each ionic concn is: K +: 0.33g/L, Na +: 0.19g/L, HCO 3 -: 0.50g/L, CO 3 2-: 0.25g/L, the pH value of solution scope is between 6.5~8.5; , the pH value of solution scope is between 6.5~8.5; Go interference with solvent to wherein adding 5000g, to adding 100g reductibility salt, reductibility salt is Na again 2SO 3Be Na 2S 2O 35H 2O is 10g, FeSO 47H 2O is 50g, FeSO 4Behind the 40g stirring reaction, reaction in about 2 minutes finishes;
Pneumatic pump continues to stir, and in reactor drum, adds 600gNa again 2CO 3
Stop air agitator, mixed solution is discharged to a bigger container, leave standstill, the discharging supernatant is to another container, and using concentration of volume percent is that 20% hydrochloric acid is regulated pH to 7.0-8.0, and qualified discharge is collected settling.
Embodiment 7:
In reactor drum, add the 1L waste liquid, fully stir waste liquid with pneumatic pump, metal ions in waste liquor concentration is Hg 2+: 3.0g/L, Cr 6+: 0.83g/L, Cr 3+: 0.20 g/L, Ag +: 2.22g/L; Interference with solvent is gone in preparation: take by weighing salt of wormwood and sodium hydrogencarbonate, preparation contains K +, Na +, HCO 3 -, CO 3 2-Solion 1000g, each ionic concn is: K +: 0.33g/L, Na +: 0.19g/L, HCO 3 -: 0.50g/L, CO 3 2-: 0.25g/L, the pH value of solution scope is between 6.5~8.5; The pH value of solution scope is between 6.5~8.5; Go interference with solvent to wherein adding 1000g, to adding 100g reductibility salt, reductibility salt is Na again 2S 2O 35H 2After O was the 100g stirring reaction, reaction in about 2 minutes finished; Pneumatic pump continues to stir, and in reactor drum, adds 600gNaOH again; Stop air agitator, mixed solution is discharged to a bigger container, leave standstill, using concentration of volume percent in discharging supernatant to another container is that 30% hydrochloric acid is regulated pH to 7.0-8.0, and qualified discharge is collected settling.
Embodiment 1-7 supernatant only contains the ion to the environment toxicological harmless, heavy metal Ag through detecting in the supernatant +, Hg 2+, Cr 3+, Cr 6+Content is almost nil, well below the index request of national standard.

Claims (6)

1. the method for treating waste liquid of potassium dichromate process on-line determination COD generation the steps include:
(1) interference with solvent is gone in preparation: take by weighing salt of wormwood and sodium hydrogencarbonate, preparation contains K +, Na +, HCO 3 -, CO 3 2-Solion, each ionic concn is: K +: 0.2-0.33g/L, Na +: 0.11-0.19g/L, HCO 3 -: 0.29-0.50g/L, CO 3 2-: 0.15-0.25g/L, the pH value of solution scope is between 6.5~8.5;
(2) in waste liquid, add the interference with solvent of going that step 1 disposed;
(3) reductibility salt is added through in the reacted mixing solutions of step 2;
(4) will pass through in the pretreated waste liquid of step 3 and add alkali, make Cr 3+, Hg 2+, Ag +Ion is converted into chemical combination attitude deposition and collects;
(5) reacted supernatant in the step 4 is carried out simple pH and handle, the pH value of regulating supernatant is 7.0-8.0.
2. the method for treating waste liquid that produces according to claim 1 potassium dichromate process on-line determination COD is characterized in that go interference with solvent in the said step 2, the quality of its adding and waste liquid volume ratio are 1000-5000g:1L.
3. the method for treating waste liquid that produces according to claim 2 potassium dichromate process on-line determination COD is characterized in that, the metal ions in waste liquor concentration that potassium dichromate process on-line determination COD produces in the said step 2 is Hg 2+: 1-6.8g/L, Cr 6+: 0-2.83g/L, Cr 3+: 0-2.83g/L, Ag +: 0.1-2.22g/L.
4. the method for treating waste liquid that produces according to claim 3 potassium dichromate process on-line determination COD is characterized in that the reductibility salt described in the said step 3 is Na 2SO 3, Na 2S 2O 35H 2O, FeSO 47H 2O, Fe 2(SO 3) 3, FeSO 4, FeCl 2In a kind of or any two or more combination, the quality of its adding with the ratio of the volume of waste liquid is: 0-100g:1L.
5. the method for treating waste liquid that produces according to claim 4 potassium dichromate process on-line determination COD is characterized in that alkali is NaOH or Na in the said step 4 2CO 3, the quality of its adding with the ratio of the volume of waste liquid is: 10-600g:1L.
6. the method for treating waste liquid that produces according to claim 5 potassium dichromate process on-line determination COD is characterized in that, the solution of regulating supernatant in the said step 5 is a kind of in hydrochloric acid soln or the sulphuric acid soln, and its concentration of volume percent is 10%-30%.
CN 201210019667 2012-01-28 2012-01-28 Method for treating waste liquid produced during on-line chemical oxygen demand (COD) determination with potassium dichromate method CN102583815B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201210019667 CN102583815B (en) 2012-01-28 2012-01-28 Method for treating waste liquid produced during on-line chemical oxygen demand (COD) determination with potassium dichromate method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201210019667 CN102583815B (en) 2012-01-28 2012-01-28 Method for treating waste liquid produced during on-line chemical oxygen demand (COD) determination with potassium dichromate method

Publications (2)

Publication Number Publication Date
CN102583815A true CN102583815A (en) 2012-07-18
CN102583815B CN102583815B (en) 2013-08-28

Family

ID=46473171

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201210019667 CN102583815B (en) 2012-01-28 2012-01-28 Method for treating waste liquid produced during on-line chemical oxygen demand (COD) determination with potassium dichromate method

Country Status (1)

Country Link
CN (1) CN102583815B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103288231A (en) * 2013-04-16 2013-09-11 山东益源环保科技有限公司 Industrial treatment process for CODCr waste liquid
CN103864196A (en) * 2014-03-19 2014-06-18 上海摩威环境科技股份有限公司 Treatment method for waste liquid produced by permanganate titration COD (chemical oxygen demand) online determination instrument
CN105417825A (en) * 2015-12-28 2016-03-23 河北科瑞达仪器科技股份有限公司 Waste liquid flash evaporation treatment method
CN105588927A (en) * 2014-11-14 2016-05-18 株式会社岛津制作所 Treatment method for waste liquid in COD measurement apparatus
CN106630298A (en) * 2017-01-19 2017-05-10 天津碧水源膜材料有限公司 Method for rapidly treating Ag<+>, Cr<6+> and Hg<2+> in industrial acidic waste liquid
CN108956853A (en) * 2018-07-16 2018-12-07 郑州市通标环境检测有限公司 A kind of method that dichromate titration measures COD in water

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1262235A (en) * 2000-01-03 2000-08-09 海门市江滨化工二厂 Process for treating part of waste liquid during production of reduction red F3B and cyclic application
DE10029146A1 (en) * 1999-06-26 2000-12-28 Merck Patent Gmbh Recycling sulfuric acid solution containing metals, preferably test solutions from determination of chemical oxygen demand, involves redox-controlled separation of silver amalgam with iron and precipitation as hydroxide
CN101993158A (en) * 2009-08-28 2011-03-30 宁波宝新不锈钢有限公司 Method for treating stainless steel cold rolling pickling waste water

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10029146A1 (en) * 1999-06-26 2000-12-28 Merck Patent Gmbh Recycling sulfuric acid solution containing metals, preferably test solutions from determination of chemical oxygen demand, involves redox-controlled separation of silver amalgam with iron and precipitation as hydroxide
CN1262235A (en) * 2000-01-03 2000-08-09 海门市江滨化工二厂 Process for treating part of waste liquid during production of reduction red F3B and cyclic application
CN101993158A (en) * 2009-08-28 2011-03-30 宁波宝新不锈钢有限公司 Method for treating stainless steel cold rolling pickling waste water

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103288231A (en) * 2013-04-16 2013-09-11 山东益源环保科技有限公司 Industrial treatment process for CODCr waste liquid
CN103288231B (en) * 2013-04-16 2014-04-02 山东益源环保科技有限公司 Industrial treatment process for CODCr waste liquid
CN103864196A (en) * 2014-03-19 2014-06-18 上海摩威环境科技股份有限公司 Treatment method for waste liquid produced by permanganate titration COD (chemical oxygen demand) online determination instrument
CN105588927A (en) * 2014-11-14 2016-05-18 株式会社岛津制作所 Treatment method for waste liquid in COD measurement apparatus
CN105417825A (en) * 2015-12-28 2016-03-23 河北科瑞达仪器科技股份有限公司 Waste liquid flash evaporation treatment method
CN106630298A (en) * 2017-01-19 2017-05-10 天津碧水源膜材料有限公司 Method for rapidly treating Ag<+>, Cr<6+> and Hg<2+> in industrial acidic waste liquid
CN108956853A (en) * 2018-07-16 2018-12-07 郑州市通标环境检测有限公司 A kind of method that dichromate titration measures COD in water

Also Published As

Publication number Publication date
CN102583815B (en) 2013-08-28

Similar Documents

Publication Publication Date Title
Grybos et al. Increasing pH drives organic matter solubilization from wetland soils under reducing conditions
Li et al. Treatment of nitrate contaminated water using an electrochemical method
Rayment et al. Soil chemical methods: Australasia
Çeribasi et al. Biosorption of Ni (II) and Pb (II) by Phanerochaete chrysosporium from a binary metal system–kinetics
Cheng et al. Heavy metals uptake by activated sludge
Chatzisymeon et al. Boron-doped diamond anodic treatment of olive mill wastewaters: statistical analysis, kinetic modeling and biodegradability
WITTBRODT et al. Reduction of Cr (VI) by soil humic acids
Pan et al. Removal of Cr (VI) from aqueous solutions by Na2SO3/FeSO4 combined with peanut straw biochar
Jarvie et al. Review of robust measurement of phosphorus in river water: sampling, storage, fractionation and sensitivity
Benatti et al. Sulfate removal from waste chemicals by precipitation
Nilsson Removal of metals by chemical treatment of municipal waste water
CN103359816B (en) Method for synthesizing modified sodium alginate flocculating agent and application of flocculating agent
CN101525190B (en) Efficient wastewater treating process based on Fenton reaction
Jiang et al. Enhanced coagulation with potassium ferrate (VI) for removing humic substances
Alverez-Gallegos et al. The removal of low level organics via hydrogen peroxide formed in a reticulated vitreous carbon cathode cell. Part 2: The removal of phenols and related compounds from aqueous effluents
Hu et al. A novel colorimetric method for field arsenic speciation analysis
Beukes et al. The reduction of hexavalent chromium by sulphite in wastewater
JP5728983B2 (en) Chemical injection control method for heavy metal scavengers
Balasubramanian et al. A comparative study of the determination of sulphide in tannery waste water by ion selective electrode (ISE) and iodimetry
Peiffer et al. Kinetics and mechanism of the reaction of hydrogen sulfide with lepidocrocite
Chang et al. Integrated copper-containing wastewater treatment using xanthate process
CN101618892B (en) Recovery and comprehensive utilization method of heavy metals in stainless steel pickling wastewater sludge
Chen et al. Kinetics of oxidation of aqueous sulfide by oxygen
Dash et al. Electrochemical denitrificaton of simulated ground water
Chaudhary et al. Electrolytic removal of hexavalent chromium from aqueous solutions

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant